Beverly Sills IrisBeverly Sills Iris is a bearded iris prized for upright flower stalks, sword like foliage, and dependable late spring color. These hardy perennials handle heat and drought once established and make excellent border and cutting garden plants. Bloom time: Late spring Height x width: 24 36 in. x 18 24 in. Light: Full sun USDA zones: 3 9 Plant rhizomes in very well drained soil with the top of the rhizome near the soil surface. Remove spent bloom stalks